—Each boy and each girl talking about optional courses（选修课）.
—Yes! And the each their favorite one!
A. is; has
B. are; have
C. is; have
D. are; has
网友回答
A. is; has
B. are; have
(答案→)C. is; have
D. are; has
解析：考查主谓一致。单数名词分别用each修饰，作并列主语是，谓语动词要用单数，排除B,D；the each作主语时，根据后面的their，可知指的是复数，所以第二空用复数形式。所以选C。